When i put the a/c on my car dies down in rpm. One issue i think is the A/C Compressor is going bad. I also think i have a vacuum leak in the same area were the compressor is because there is a hising sound. Sometimes my rpm is goes above 1000 and sometimes below at idle. I also noticed that the shifter is more harder to shift. I have a 2004 svt cobra and it is modified and makes 640 rwhp so I don't know if any of that has to do with it. The car never overheats and oil temp is a little above normal but the gauages and reading seems to be correct.
Is what i wrote seem accurate or could it be something more?
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When you turn on your ac this engages the ac compressor clutch which then puts more drag on the pulley and accessory belt driven by the engine. Which explains why at idle the rpms will dip a little bit and then recover as the engine tries to find idle again with the additional power demand from the AC.
If you had a Vacuum leak, you'd be getting a bouncy idle or at the very least a "system too lean" or misfiring depending on where the leak is coming in from.
I don't know what mods you have or how much more HP in terms of % than stock but a heavily modified car will never idle or run as smooth at the lower end of the powerband, simply the factory tune / equipment was not engineered for the added power.0
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